'use client'

import * as React from 'react'
import { Button } from '@/components/ui/button'
import { Label } from '@/components/ui/label'
import { Checkbox } from '@/components/ui/checkbox'
import {
  Dialog,
  DialogContent,
  DialogDescription,
  DialogFooter,
  DialogHeader,
  DialogTitle,
} from '@/components/ui/dialog'
import {
  Command,
  CommandEmpty,
  CommandGroup,
  CommandInput,
  CommandItem,
  CommandList,
} from '@/components/ui/command'
import {
  Popover,
  PopoverContent,
  PopoverTrigger,
} from '@/components/ui/popover'
import { Tabs, TabsContent, TabsList, TabsTrigger } from '@/components/ui/tabs'
import { ChevronsUpDown, Loader2, X, Plus } from 'lucide-react'
import { createBiddingDetailVendor } from '@/lib/bidding/detail/service'
import { searchVendorsForBidding, getVendorsBusinessSize } from '@/lib/bidding/service'
import { useToast } from '@/hooks/use-toast'
import { useTransition } from 'react'
import { Badge } from '@/components/ui/badge'
import { Card, CardContent, CardDescription, CardHeader, CardTitle } from '@/components/ui/card'

interface BiddingDetailVendorCreateDialogProps {
  biddingId: number
  open: boolean
  onOpenChange: (open: boolean) => void
  onSuccess: () => void
}

interface Vendor {
  id: number
  vendorName: string
  vendorCode: string
  status: string
}

interface SelectedVendorWithQuestion {
  vendor: Vendor
  isPriceAdjustmentApplicableQuestion: boolean
}

export function BiddingDetailVendorCreateDialog({
  biddingId,
  open,
  onOpenChange,
  onSuccess,
}: BiddingDetailVendorCreateDialogProps) {
  const { toast } = useToast()
  const [isPending, startTransition] = useTransition()
  const [activeTab, setActiveTab] = React.useState('select')

  // Vendor 검색 상태
  const [vendorList, setVendorList] = React.useState<Vendor[]>([])
  const [selectedVendorsWithQuestion, setSelectedVendorsWithQuestion] = React.useState<SelectedVendorWithQuestion[]>([])
  const [vendorOpen, setVendorOpen] = React.useState(false)

  // Business size 정보 캐싱
  const [businessSizeMap, setBusinessSizeMap] = React.useState<Record<number, string | null>>({})

  // 벤더 로드
  const loadVendors = React.useCallback(async () => {
    try {
      const result = await searchVendorsForBidding('', biddingId) // 빈 검색어로 모든 벤더 로드
      setVendorList(result || [])
    } catch (error) {
      console.error('Failed to load vendors:', error)
      toast({
        title: '오류',
        description: '벤더 목록을 불러오는데 실패했습니다.',
        variant: 'destructive',
      })
      setVendorList([])
    }
  }, [biddingId, toast])

  React.useEffect(() => {
    if (open) {
      loadVendors()
    }
  }, [open, loadVendors])

  // 초기화
  React.useEffect(() => {
    if (!open) {
      setSelectedVendorsWithQuestion([])
      setActiveTab('select')
    }
  }, [open])

  // 벤더 추가
  const handleAddVendor = (vendor: Vendor) => {
    if (!selectedVendorsWithQuestion.find(v => v.vendor.id === vendor.id)) {
      setSelectedVendorsWithQuestion([
        ...selectedVendorsWithQuestion,
        {
          vendor,
          isPriceAdjustmentApplicableQuestion: false
        }
      ])
    }
    setVendorOpen(false)
  }

  // 벤더 제거
  const handleRemoveVendor = (vendorId: number) => {
    setSelectedVendorsWithQuestion(
      selectedVendorsWithQuestion.filter(v => v.vendor.id !== vendorId)
    )
  }

  // 이미 선택된 벤더인지 확인
  const isVendorSelected = (vendorId: number) => {
    return selectedVendorsWithQuestion.some(v => v.vendor.id === vendorId)
  }

  // 연동제 적용요건 문의 체크박스 토글
  const handleTogglePriceAdjustmentQuestion = (vendorId: number, checked: boolean) => {
    setSelectedVendorsWithQuestion(prev =>
      prev.map(item =>
        item.vendor.id === vendorId
          ? { ...item, isPriceAdjustmentApplicableQuestion: checked }
          : item
      )
    )
  }

  const handleCreate = () => {
    if (selectedVendorsWithQuestion.length === 0) {
      toast({
        title: '오류',
        description: '업체를 선택해주세요.',
        variant: 'destructive',
      })
      return
    }

    // Tab 2로 이동하여 연동제 적용요건 문의를 확인하도록 유도
    if (activeTab === 'select') {
      setActiveTab('question')
      toast({
        title: '확인 필요',
        description: '선택한 업체들의 연동제 적용요건 문의를 확인해주세요.',
      })
      return
    }

    startTransition(async () => {
      let successCount = 0
      const errorMessages: string[] = []

      for (const item of selectedVendorsWithQuestion) {
        try {
          const response = await createBiddingDetailVendor(
            biddingId,
            item.vendor.id,
            item.isPriceAdjustmentApplicableQuestion
          )

          if (response.success) {
            successCount++
          } else {
            errorMessages.push(`${item.vendor.vendorName}: ${response.error}`)
          }
        } catch {
          errorMessages.push(`${item.vendor.vendorName}: 처리 중 오류가 발생했습니다.`)
        }
      }

      if (successCount > 0) {
        toast({
          title: '성공',
          description: `${successCount}개의 업체가 성공적으로 추가되었습니다.${errorMessages.length > 0 ? ` ${errorMessages.length}개는 실패했습니다.` : ''}`,
        })
        onOpenChange(false)
        resetForm()
        onSuccess()
      }

      if (errorMessages.length > 0 && successCount === 0) {
        toast({
          title: '오류',
          description: `업체 추가에 실패했습니다: ${errorMessages.join(', ')}`,
          variant: 'destructive',
        })
      }
    })
  }

  const resetForm = () => {
    setSelectedVendorsWithQuestion([])
    setActiveTab('select')
  }

  const selectedVendors = selectedVendorsWithQuestion.map(item => item.vendor)

  // 선택된 vendor들의 businessSize 정보를 useMemo로 캐싱
  const loadBusinessSize = React.useMemo(() => {
    const selectedVendorIds = selectedVendors.map(v => v.id)
    if (selectedVendorIds.length === 0) return

    // 이미 로드된 vendor들은 제외
    const newVendorIds = selectedVendorIds.filter(id => !(id in businessSizeMap))

    if (newVendorIds.length > 0) {
      getVendorsBusinessSize(newVendorIds).then(result => {
        setBusinessSizeMap(prev => ({ ...prev, ...result }))
      }).catch(error => {
        console.error('Failed to load business size:', error)
      })
    }
  }, [selectedVendors, businessSizeMap])

  // selectedVendors가 변경될 때마다 businessSize 로드
  React.useEffect(() => {
    loadBusinessSize
  }, [loadBusinessSize])

  return (
    <Dialog open={open} onOpenChange={onOpenChange}>
      <DialogContent className="max-w-4xl max-h-[90vh] p-0 flex flex-col">
        {/* 헤더 */}
        <DialogHeader className="p-6 pb-0">
          <DialogTitle>협력업체 추가</DialogTitle>
          <DialogDescription>
            입찰에 참여할 업체를 선택하고 연동제 적용요건 문의를 설정하세요.
          </DialogDescription>
        </DialogHeader>

        {/* 탭 네비게이션 */}
        <Tabs value={activeTab} onValueChange={setActiveTab} className="flex-1 flex flex-col px-6">
          <TabsList className="grid w-full grid-cols-2">
            <TabsTrigger value="select">
              1. 입찰업체 선택 ({selectedVendors.length}개)
            </TabsTrigger>
            <TabsTrigger 
              value="question"
              disabled={selectedVendors.length === 0}
            >
              2. 연동제 적용요건 문의
            </TabsTrigger>
          </TabsList>

          {/* Tab 1: 입찰업체 선택 */}
          <TabsContent value="select" className="flex-1 overflow-y-auto mt-4 pb-4">
            <Card>
              <CardHeader>
                <CardTitle className="text-lg">업체 선택</CardTitle>
                <CardDescription>
                  입찰에 참여할 협력업체를 선택하세요.
                </CardDescription>
              </CardHeader>
              <CardContent>
                <div className="space-y-4">
                  {/* 업체 추가 버튼 */}
                  <Popover open={vendorOpen} onOpenChange={setVendorOpen}>
                    <PopoverTrigger asChild>
                      <Button
                        variant="outline"
                        role="combobox"
                        aria-expanded={vendorOpen}
                        className="w-full justify-between"
                        disabled={vendorList.length === 0}
                      >
                        <span className="flex items-center gap-2">
                          <Plus className="h-4 w-4" />
                          업체 선택하기
                        </span>
                        <ChevronsUpDown className="ml-2 h-4 w-4 shrink-0 opacity-50" />
                      </Button>
                    </PopoverTrigger>
                    <PopoverContent className="w-[500px] p-0" align="start">
                      <Command>
                        <CommandInput placeholder="업체명 또는 코드로 검색..." />
                        <CommandList>
                          <CommandEmpty>검색 결과가 없습니다.</CommandEmpty>
                          <CommandGroup>
                            {vendorList
                              .filter(vendor => !isVendorSelected(vendor.id))
                              .map((vendor) => (
                                <CommandItem
                                  key={vendor.id}
                                  value={`${vendor.vendorCode} ${vendor.vendorName}`}
                                  onSelect={() => handleAddVendor(vendor)}
                                >
                                  <div className="flex items-center gap-2 w-full">
                                    <Badge variant="outline" className="shrink-0">
                                      {vendor.vendorCode}
                                    </Badge>
                                    <span className="truncate">{vendor.vendorName}</span>
                                  </div>
                                </CommandItem>
                              ))}
                          </CommandGroup>
                        </CommandList>
                      </Command>
                    </PopoverContent>
                  </Popover>

                  {/* 선택된 업체 목록 */}
                  {selectedVendors.length > 0 && (
                    <div className="space-y-2">
                      <div className="flex items-center justify-between">
                        <h4 className="text-sm font-medium">선택된 업체 ({selectedVendors.length}개)</h4>
                      </div>
                      <div className="space-y-2">
                        {selectedVendors.map((vendor, index) => (
                          <div
                            key={vendor.id}
                            className="flex items-center justify-between p-3 rounded-lg bg-secondary/50"
                          >
                            <div className="flex items-center gap-3">
                              <span className="text-sm text-muted-foreground">
                                {index + 1}.
                              </span>
                              <Badge variant="outline">
                                {vendor.vendorCode}
                              </Badge>
                              <span className="text-sm font-medium">
                                {vendor.vendorName}
                              </span>
                            </div>
                            <Button
                              variant="ghost"
                              size="sm"
                              onClick={() => handleRemoveVendor(vendor.id)}
                              className="h-8 w-8 p-0"
                            >
                              <X className="h-4 w-4" />
                            </Button>
                          </div>
                        ))}
                      </div>
                    </div>
                  )}

                  {selectedVendors.length === 0 && (
                    <div className="text-center py-8 text-muted-foreground">
                      <p className="text-sm">아직 선택된 업체가 없습니다.</p>
                      <p className="text-xs mt-1">위 버튼을 클릭하여 업체를 추가하세요.</p>
                    </div>
                  )}
                </div>
              </CardContent>
            </Card>
          </TabsContent>

          {/* Tab 2: 연동제 적용요건 문의 체크 */}
          <TabsContent value="question" className="flex-1 overflow-y-auto mt-4 pb-4">
            <Card>
              <CardHeader>
                <CardTitle className="text-lg">연동제 적용요건 문의</CardTitle>
                <CardDescription>
                  선택한 업체별로 연동제 적용요건 문의 여부를 체크하세요.
                </CardDescription>
              </CardHeader>
              <CardContent>
                {selectedVendorsWithQuestion.length === 0 ? (
                  <div className="text-center py-8 text-muted-foreground">
                    <p className="text-sm">선택된 업체가 없습니다.</p>
                    <p className="text-xs mt-1">먼저 입찰업체 선택 탭에서 업체를 선택해주세요.</p>
                  </div>
                ) : (
                  <div className="space-y-4">
                    {selectedVendorsWithQuestion.map((item, index) => (
                      <div
                        key={item.vendor.id}
                        className="flex items-center justify-between p-4 rounded-lg border"
                      >
                        <div className="flex items-center gap-4 flex-1">
                          <span className="text-sm text-muted-foreground w-8">
                            {index + 1}.
                          </span>
                          <div className="flex-1">
                            <div className="flex items-center gap-2 mb-1">
                              <Badge variant="outline">
                                {item.vendor.vendorCode}
                              </Badge>
                              <span className="font-medium">{item.vendor.vendorName}</span>
                            </div>
                          </div>
                        </div>
                        <div className="flex items-center gap-2">
                          <Checkbox
                            id={`question-${item.vendor.id}`}
                            checked={item.isPriceAdjustmentApplicableQuestion}
                            onCheckedChange={(checked) =>
                              handleTogglePriceAdjustmentQuestion(item.vendor.id, checked as boolean)
                            }
                          />
                          <Label
                            htmlFor={`question-${item.vendor.id}`}
                            className="text-sm cursor-pointer"
                          >
                            연동제 적용요건 문의
                          </Label>
                          <span className="text-xs text-muted-foreground">
                            기업규모: {(() => {
                              switch (businessSizeMap[item.vendor.id]) {
                                case 'A':
                                  return '대기업';
                                case 'B':
                                  return '중견기업';
                                case 'C':
                                  return '중소기업';
                                case 'D':
                                  return '소기업';
                                default:
                                  return '-';
                              }
                            })()}
                          </span>
                        </div>
                      </div>
                    ))}
                  </div>
                )}
              </CardContent>
            </Card>
          </TabsContent>
        </Tabs>

        {/* 푸터 */}
        <DialogFooter className="p-6 pt-0 border-t">
          <Button
            variant="outline"
            onClick={() => onOpenChange(false)}
            disabled={isPending}
          >
            취소
          </Button>
          {activeTab === 'select' ? (
            <Button
              onClick={() => {
                if (selectedVendors.length > 0) {
                  setActiveTab('question')
                } else {
                  toast({
                    title: '오류',
                    description: '업체를 선택해주세요.',
                    variant: 'destructive',
                  })
                }
              }}
              disabled={isPending || selectedVendors.length === 0}
            >
              다음 단계
            </Button>
          ) : (
            <Button
              onClick={handleCreate}
              disabled={isPending || selectedVendorsWithQuestion.length === 0}
            >
              {isPending && <Loader2 className="mr-2 h-4 w-4 animate-spin" />}
              {selectedVendorsWithQuestion.length > 0
                ? `${selectedVendorsWithQuestion.length}개 업체 추가`
                : '업체 추가'
              }
            </Button>
          )}
        </DialogFooter>
      </DialogContent>
    </Dialog>
  )
}